Starting switch for electric motors



Dec. 11, 1923. v 1,476,777

E. E. TAEUBERT 1 STARTING SWITCH FOR ELECTRIC MOTORS Filed March so.1920 i 5 Sheets-Sheet 1 13/ I H W Hm o k A 4" W 1 4a 10 j M J10 J12 l jin .kr I

16 k 10 11 If jib Dec. 11 1923.

E. E. TAEUBERT STARTING SWITCH FQR ELECTRIC MUTORS Filed March 30, 1920H lllllllnllllllll 5 Sheets-Sheet 2 i INVENTOR.

4 13 1 mat/242776261165 A ATTORN s.-

E.E.TAEUBERT STARTING SWITCH FOR ELECTRTC MOTORS Dec. 11, 1923.

1920 5 sheets sheet 5 Filed March 30.

lmma:

INVENTOR.

Dec. 11, 1923. 1,476,777

' E. E. TAEUBERT STARTING SWITCH FOR ELECTRIC MOTORS Filed March 50,1920 5 Sheets-Sheet 4 IN V EN TOR. jafirzurzdlffieubenzj BY ATTORNEYS}Dec. 11, 1923. 1,476,777

E. E. ,TAEUBERT STARTING SWITCH FOR ELECTRIC MOTORS Filed March 30. 19205 Sheets-Sheet 5 $9.15 J fllllllnnu J7 -4 A INVENTOR. MumdEZkezfie/Zj ATTORNE YS.

Patented Dec. 11, 1923.

UNITED- STATES PATENT O FFICE.

EDMUND E. TAEUBERT, 01 I08 ANGELES, CALIFORNIA, ASSIGNOR TO LEO M.HARVEY, OF LOS ANGELES, CALIFORNIA.

STARTING SWITCH FOR ELECTRIC MOTORS.

Application filed March 30, 1920. Serial No. 372,375.

To all whom it may concern: I serving to 'deenergize the operatingmagnet, Be it known that I. EDMUND E. TAEU- together with means wherebysaidmagnet near, a citizen of the United States, and a may not again beenergized until the mad resident of Los Angeles, in the county of ualoperation of the starting button; thus 8 Los Angeles, State ofCalifornia, have inproviding no voltage protection for the vented newand useful Improvements in switch. Starting Switches for ElectricMotors, of Fourth: to eliminate noise asfar as possiwhich the followingis a specification. ble. which in devices of this character, espe- Thisinvention relates in general to a cially in the case of alternatingcurrent 10 form of electric switch generally known as switches, employmagnets of the usual charthe magnetic type, which is adapted to beacter. To this end I have provided a speinterposed, as in the case ofall switches, in cial form of alternating current magnet, in the powercircuit between the main source which entirely new principles areemployed, of current supply and the motor, and it reso as to eliminatevibration and singing lates more particularly to a switch having socommon to alternating current magnets, certain automatic featureswhereby the as stated..- regulation of the electric current may beFifth: the complete enclosure of all workeflected under all conditionsand in all ciring parts of the switch in a heavy sheet iron cumstances,without damage or injury to base, suitably mounted for convenience andthe elements included in the circuit. so arranged that the opening ofthe case The main object of my invention is to will automatically openthe switch and open provide an electric switch of the magnetic theoperating magnet circuit until the case type adapted to be connectedwith and to is again closed. With the case and the function between thepower line, or source switch open, as stated, the fuse clips are ofsupply, and the service line in which dead, thus rendering it possibleto renew may be included an electric motor. or other the fuse withoutdanger of shock. power consuming element, having certain Sixth: theprovision of a simple, connovel structural characteristics,arrangevenient and effective design of switch, case ments of parts andfeatures whereby the and parts, easily accessible for the purposefollowing subsidiary objects may be accomof cleaning, renewing or forany other purplished: pose; and the arrangement of all parts,

First: to allow the starting current from wires, etc., in such a mannerthat they may the power line to the motor to flow without be readilyconnected to the parts within the interruption for a necessary length oftime case, or withdrawn and disconnected therewithout the necessity ofadjustment, so that from.

the increase of current itself will retain the In addition to the abovegeneral objects, switch in starting position until the current some ofthe specific objects of invention has dropped to normal, at which timethe are: switch will be automatically operated so as .The provision of aswitch having fuses to include the fuses in the motor current. connectedwith the power'line and a mov- Second: to provide, in such a switch,proable switch contact member arranged for tection against overloadingof the circuit, initial connection with said power line ex by theintrusion in said circuit of standard clusively of said fuses andfinally movable cartridge fuses adapted to adequately prointo and forconnection with said power 1 tcct against excessive current. lineinclusively of said fuses.

Third: to provide means whereby the The provision, in a switch of thecharmain contact members of the switch will acter described, of duplexpower line conautomatically be disconnected by gravity tacts, movableswitch members arranged when the power supply is off for any reason, forinitial contact with one and final contl e failure of the voltage. inthe power line tact with the other contacts, electric fuses tactsuccessively therewith, and a suitable magnet for effecting theoperation of said movable member, so as to provide an initial powercircuit excluding the line fuses and a final circuit including saidfuses.

The provision of a switch of the character stated embodying analternating magnet and a contact member operated thereby, for initiallyoperating said contact member to a partial extent and subsequentlyoperating the same/to a maximum extent for, respectively, cutting outand in the fuses of the line for the purposes mentioned.

Other objects may appear as the description progresses.

Referring to the drawings of my invention, forming a part of thisapplication and appended hereto, I have shown one practical embodimentof my invention, which is capable of substantial modification andalteration, according to the necessities of each occasion. In saiddrawings- Fig. 1 is a front elevation of my switch, with the front ofthe case removed.

' Fig. 2 is a sectional elevation .of, the same.

Fig. 3 is an elevation, partly in section, of the controlling magnet andtripping mechanism.

Fig. 4: is a fragmentary elevation of the switch showing one of theswitch contact tracks and roller operating thereover for guiding themovable switch contact into and from operating position.

, Fig. 5 is a section of the same.

Fig. 6 is an enlarged fragmentary section of one of said tracks andassociated parts.

Fig. 7 is a transverse section of the assembled switch.

Figs. 8, 9 and 10 are sections of my improved alternating currentmagnet, showing respectively, the rotatable armature thereof incompletely closed, partially closed and completely open positionsrelative to the outer yokes, or keeper of the magnet.

Fig. 11' is a circuit diagram of the electrical connections of theswitch and elements associated therewith.

Fig. 12 is a perspective view of the switch mounted upon a suitableframe, or stand, for convenience and accessibility.

Fig.- 13 is an enlarged side view of the yieldable limiting memberassociated with the magnet tripping device for regulating the movementof the magnet armature.

aerate? Fig. ltis an enlarged view of the mag net, and trippingmechanism, showing the latter mechanism in section.

Fig. 15 is a perspective view of one of the contact fingers and supporttherefor.

Fig. 16 is a view of the automatic safety cut-out switch.

T have employed similar characters throughout the several views of thedrawings and in the specification hereinafter following for indicatingthe same and like parts, the, structure and operation of which I willnow describe in detail and at length in order that those skilled in theart may readily comprehend the use and operation of my improvements.

The following facts should be considered and understood-at the outset ofthe description of my device, to-wit: v V

In the device of my invention T have provided means for overcoming allof the disadvantages of the usual forms of starters and other allieddevices and at the same time have provided additional features andcharacteristics which have heretofore been unknown and afford a greaterdegree of protection, in a simple form and arrangement of parts, thansaid other device, and therefore aflord a more elastic unit ofoperation, entirely automatic and having all necessary safety appliancesso as to insure against damage and injury to the switch mechanism or theoperator.

In the drawings hereinbefore referred to C represents a case and C acover therefor which is adapted to fit snugly over the inturned edges 1of the case and may be hingedly connected at the top edge by means pf ana-ngularly bent strip 2 which hooks under a correspondingly bent portion3 of the case. At the bottom member C is held against the case G bymeans of a beep at and may be locked by means of an ordinary lock 5engaging a staple 6 attached to the bottom of the case, the front end ofthe hasp being bent upwardly and out-. wardly in front of and inengagement with the front side of the cover as shown in Fig. 2.

The case C may be mounted on the wall in some cases or upon a suitableframe, or standard F adapted to rest upon the floor in any suitablelocation, the case being held on said frame by means of bolts 5', 5',etc., extending through the rear wall 6 of the case and the legs of theframe.

The upper portion of case C has a flat panel P of usual character and ofinsulating material, such as slate or the like, held on the side wallsof the case by means of strap irons 7, 7. etc., riveted to the said sidewalls and attached to the panel P by means of bolts 8, 8, etc, saidpanel being substantially spaced from the rear walls of the case so asto affordample room at the rear ill) thereof for the necessary wires andconnections leading to and from the several elements of the switchmechanism.

The lower portion of the case C, below the panel I houses a suitable andpreferable form of alternating current magnet M which includes spacedend members 9, attached to the rear wall (3' of the case by means ofbolts 10, which extend through feet 11, integral with said end members,and a central laminated keeper portion K, all of said magnet parts beingheld together by means of stay bolts 12.

A triple pole switch is mounted on the face of the panel I and near theupper edge thereof I have provided the usual cartridge fuses F, F, F,held in ordinary fuse clips,

f, f, 7. Below and slightly spaced from.

said fuses I have provided three pairs of contact plates, alined withthe fuses, and the ends of the upper plates a, 0,0, thereof aresubstantially spaced from the ends of the lower plates c, c. The upperplates 0, 0, c are attached to the fuse clips f, f, f",

- respectively by means of screws, or terminals 13, 13', 13", and thelower portions thereof are bent outwardly from the panel P and thencedownwardly as shown, in the d irectiori of the ends of-the lower plates0, 0', a

Likewise the lower plates are attached to the anel P by means of screws,or termina s, 14, 14', 14", and are bent out wardly and upwardly in thedirection of the upper plates. Thus the end,p0rtions 15, 15, 15 of theupper plates and those 16, 16, 16 of the lower plates are alinedvertically and parallel with the panel 1 and said plates rest uponmountings D, D, D, of insulating material and comprise side plates 17,17, 17, which are attached to metal b'rack ets 18, 18, 18 held on theface of the panel, floor portions 19, 19, 19 attached to said sideplates and forming supports for the contact plates C and G and shorterside plates 20,

20. 2O suitably attached to the other members of the mountings andspaced from the space of the panel P.

Blow-out coils B, B, B, are provided, respectively, between the plates19, 19, 19 of mountings I), D, D, and the face of the panel P and arewound around cores held between the floor portions described and saidpanel by means of screws 21, 21, 21. Thewires 22, 22, 22, of said coilsare attached at one of their ends to the motor line terminals m, m andm", respectively, at the upper end of the panel P and the other endsthereof are attachedto the contact plate terminals 14, 14,

14, respectively. The said terminals 14, 14', 14", are connected bymeans of wires 23, 23, 23, with the fuse cli terminals 7, f, f" at theupper ends of the use clips. respectively. Thus connections areestablished through and around the fuses F, F, F", of the switch bymeans of said parts and the arrangement described, for reasons whichwill hereinafter appear. l

()n thelower portion of the panel P and near the sides thereof I providea pair of guide members G, provided with internally extended ribs 24,forming tracks for rollers 11, carried on the opposite ends of a squaretransverse shaft- S, said rollers having flanges 25, overlying the edgesof said ribs. It will be noted that in the central portion of saidguides I have provided pivoted switch members Gr, held on pivot screws26, carried in.

lower diagonal portions 31 paralleling the inner edge of members G whenin the osition shownjn Fig. 4. Guide members are held on the face of thepanel P by means of screws 32, or bolts extended through feet 32thereof. 1

The shaft S, hereinbefore referred to, is

of square crosssection and is completely insulated with mica or othersuitable material and said shaft carries a triplet of contact plates, orfingers 0 c, 0", which are yieldablv held in brackets 12, b, b,respectively, and consisting of members 33 and 34 held together onopposite sides of said shaft by means of screws 35, 37 of the members 33are bent inwardly in the direction of the panel P and have slots 38therein through which said contact fingers extend. Also, the upper endsof said fingers are bent inwardly to afford flat con-,

tact portions 40 for contact with the portions 15 of the stationarycontact plates 0 and 16 of thelower plates 0'. tween the outer portionsof the plates 33 and the fingers 0' serve to hold said fingersresiliently and yieldably at the bottoms of the slots 38 39 in thebracket members, so that they may yield outwardly when required.

The lower ends 42 42 and 42" of fingers 0" are attached at 43, 43, towires 44, 445 and 44", respectively, which are of ample length andflexible enou h to permit the movement of the shaft S an connections,and said wires connect at their other ends with the line terminals L, Land L, leading to a source of The extremities 36 and Springs 41 held be46 and 47 etween which are adjustablv held,

near each side of the switch, vertically disposed bars 48. These barshave square openings toreceive the shaft S so as to prevent ltl the barsturning thereon, and have elongated slots 49, in their lower portionsthrough which the extended'ends of the armature shaft 50 of the magnet Mextend. Thus the bars 48 are slidable on the shaft 50, and rollers 51,carried on said bars above the slots 49 are alined with and adapted toengage the edges of arms 52, 52 fixed to the shaft 50 adjacentto thebars 48. This structure is clearly shown in Figs 1 and 2.

Magnet M has a pivoted armature A, as shown in Figs. 8, 9 and 10, aroundwhich is a suitable winding '10. The peripheral portions a, a, of saidarmature are spirally formed relative to the axis of the armature shaft50, and the portions 53, of the keeper K of the magnet are alsosimilarly and correspondingly formed so that the curves of the portionsa and 53, during the movement of the armature, may at all times be sorelated that all points on the portions a of the armature will beequidistant from opposite points on'the portions 53 of the keeper. Inthis connection, it will be noted that air gaps 54:, are providedbetween opposite portions of the keeper K of the magnet and two of thestay bolts 12 of the magnet are of brass or other nonmagnetic materialso as to provide against what is known as a magnetic circuit.

The rotation of the armature shaft 50 j is clockwise and the differentpositions thereof are shown in Figs. 8, 9 and 10, Thus, as the armatureis rotated, the arms 52 which are fixed to said shaft midway of theirends, are also rotated in a clockwise direction as viewed in Fig. 2, andthe cam portions 55,0fsaid arms engage the rollers 51, on bars 48, andlift said bars together with the transverse shaft S and the contactplates 0 thereon. .With the parts in the positions shown in Fig. 2, thebars 48 are raised so as to make the movable contacts 0" register andmake contact with the lower contact plates 0. This initial action' isaccomplished through the medium of the starting button S which effectsthe energization of the magnet M, as in other switches, and the fuses F,F and F" are omitted from the power circuit, the circuit being completedaround the fuses by means of the wires 22, through terminals 14, 14 and14C and the coils B and motor line terminals m, m and m". The startingcurrent is allowed to flow without interrup-.

tion for a necessary length of time by means of the following describedmecha-- nism. On one end of theshaft 50 of the armature ll provide alimiting device consisting of a pair of flat side members 56 and 57,which are connected at the opposite ends by transverse members 58 and59, and a central split clamp member having a pair of arms 60 and 61held on the shaft at) by means of'a heavy-screw 62. On the mal positionof the. limiting integer extends carry plungers 60 and 61 on their inneradjacent portions which engage the plates 65 and bear against oppositeportions of a transverse pin 69 held in the side plates 56 and 57, thesaid plates being o rigidly connected together in the. manner describedand not fixed to the shaft 50 have a difierential movement relative tothe clamp arms 60 and 61. The extent of this differential movementcorresponds to the difference in diameter between the pin 69 of thedeyice and the width of the gap between arms 60 and 61 adjacent to saidNow, when the bars 48 have been actuated to the extent described forproviding starting current without interruption to the motor, thetransverse member 58 will engage the end 70 of a dog 71 pivoted on oneof the sta bolts 12 of the magnet M, as shown in ig. 3 at theintermediate position indicated in broken lines. The normechanism justdescribed is indicated in 11 lines and the normal position of the member71 is indicated in broken lines in Fig. 3.

Now when the mechanism is at rest member 58 will rest against anadjusting pin, or screw 72 held in a. lug 73 on the magnet frame and themember 59 is adapted to rest against and be limited in the'extent of itsaction by engagement with a similar screw 74E held in a similar lug 75on the magnet frame.

The dog 71 is actuated by a solenoid. Y having a coil 7 5' supported ona bracket 7 6' attached to the magnet frame. Said solenoid has anadjustable armature 77 carried on a vertically slidable stem 78 andslidably held at the top in a boss 79 formed on the magnet frame. Thedownward movement of the armature stem 78 is limited by means of nuts 80on the upper end of the stem and above the boss 79 and other nuts 81,carried below the upper end of and within the counterbore 82 of saidboss limit the movement of thestem upwardly. The outer end of the dog 71has a yoke 83 thereon which straddles the stem 7 8 and is connectedtherewith for operation, the end thereof resting on the uppermost of thenuts 85 for movement With the stem.

vNormally the armature and stem of the solenoid are held downwardly bygravity so that the yoke 83 of dog 71 is engaged by the lower nut 85, sothat the dog 71 may be ralsed thereby into the position shown in brokenlines in Fig. 3.

The solenoid is adapted to be energized.

by means of the connections hereinafter described and in the mannerstated, momentarily with the depressing ofv the starting button. S andthe completion of the starting circuit. The armature of the solenoid istherefore elevated so that the nuts 85 raise the yoke 83 of dog 71 andthus prevent the further turning of shaft of the magnet M, by reason ofthe engagement of the member 58 with the end of the dog 71, as shown inFig. 3. With the drop in current and the normal amount of current in thepower circuit, the solenoid is insufficient for supporting its stem andthe member 58 is permitted to pass the dog 71, thus permitting the fur?ther rotation of shaft 50 of the armature.

The further movement of the shaft S and its contacts 0', whichcorresponds to and is effected by the further rotation of shaft 50,further elevates the rollers R of shaft S into the extreme position 290f the guides G as shown in Fig. 4 and the end portions 86 of the arms52 engage and rest immediately "beneath the rollers 51, as shown inbroken lines atthe right of Fig. 14. In this instance it is intendedthat the rollers 51 will be on the vertical centerline of the armatureshaft 50 and the members 56-57 and --61 are held by the pull of themagnet M in strained relation against the tension of the spring 66. Thisfeature insures the restoration of the parts, from a dead center, tonormal position and the fall by gravity, without obstruction. the momentthe magnet M is deenergized for any reason whatsoever.

It will be noted in Fig. 12 that the starting and stopping buttons S andS are held in a suitable and well-known type of case 88 which may beattached in the manner shown, or otherwise, by means of a flexible tube89, with the case C. This connection may be as shown in Fig. 2, by theemployment of a nipple 90 and a lock nut 91 on the inner end thereof andadapted to engage the inner side of the upper wall of the case.

An automatic cut-out device is provided at one side of the switch on thepanel P and includes a pair of clips 92 and 93 having terminals 94 and95, respectively, for holding the said clips on the face of the panel P,and a bridge contact plate 96 pivotally held (6n the upper clip 92 sothat when the front carried between the outer lip 98 of clip 92 and theupper end of contact plate 96 will cause the opposite end of said plate96 to disengage the lower clip 93. This automatic cut-out device is. inseries with the control magnet Mso that itwill be readily apparent thatwhen the case cover is detached and removed, fiat springs 99 attached isremoved from the case C a spring 97 to the bridge plate 92 being held inengagement with a roller 1* carried on a stud r on said cover when innormal position on case wires M andM connect respectively with lineterminals m, and m, while the terminal on connects with one end of thesolenoid coil by means, of wire M The opposite end of coil 75 connectswith an auxiliary terminal M on the panel P b means of wire M and thethird line wire Ll connects also therewith. Thus the solenoid Y is seento be in series with one side of the motor circuit and it will beenergized the moment the motor circuit is completed.

The point 100 of the starting button S is connected by wire 101 withline terminal L of the switch, and point 102 of said button is connectedby'wire 103 with terminal 14,the starting circuit being completed by thedepressin of button S Point 104 of stop button 102 of start button S bywire 105, and point 106 is connected by wire 107 with. terminal 94 ofthe automatic cut-out device operated by the removal of the cover C. Thedepressing of stop button S breaks the circuit and opens the switch.

The source of current supply may be connected by means of wires L, L andL with switch terminalsL, L and L" so that when the power circuit isclosed either through or around the fuses F, F, F", current will besupplied to the motor. It will be understood in this connection thatwhen the contacts 0' and c" are engaged the current flows throughcontacts 0', terminals 14, 14' and 2 is connected withpoint 14" blow-outcoils B, B, B, and to the motor terminals m, m, and m". When contact iscompleted between the contacts a and 0" the current flows throughcontacts 0 fuses F, F, F wires 23, blow-out coils B, and wires 22, tothe motor terminals,-thus cutting in the fuses in the circuit.

The automatic cut-out switch between terminals 94 and 95 is in series inone-side of the magnet circuit to the start andstop buttons S and Sterminal 95'being connected 9 with the winding w of the magnet M bymeans of a wire- 111, the other end of the winding being connected withline termi-' nal L of the switch by means of a wire 112. Thus when thecover is removed the connection between the terminals is broken and themagnet circuit is opened 50 that the switch will be inoperative.

The blow-out coils B serve'the usual purpose of extinguishing orpreventing the arcing of the current between the ends of contacts c andc as the latter are moved upwardly in the direction of the former, andalso between contacts and 0 when the final circuits are established. Thelines of force in the Vicinity of the coils B act to prevent, or toextinguish any arcs which may be created between these elements. Thisphenomena is well known in the art and not of my discovery.

contacts ,0" instead of being moved vertically into contact with theplates 0, or 0', are moved both upwardly and inwardly and a quickercontact between the contacts may be effected by reason of this feature.

llt will be observed that the contact of the 7 members a" with theplates 0' begins with the meeting of the bent edges of the respectivemembers and any arcing that may occur is confined to these points onlyinasmuch as subsequent motion of the contacts 0 results in a slidingengagement of the said members. This action gives a wiping contactassuring even wear thereof and practically precludingpitting of therespective members. The contact is made rapidly and I as a furtherprecaution against wear with till a view to increasing the life of thecontacts the action takes place in a strong magnetic field which willblow out any are that may occur. The latter feature is a decidedadvantage in the case of higher voltages. The necessity of maintainingoil about the contacts is eliminated in my improved device.

Likewise, on the return stroke, when no voltage occurs on the powerline, or when the stop button is depressed for opening the switch, thecontacts 0" first move directly away fromand out of contact with thecontacts 0 instead of first slidingthereover for a slight distance, therollers then moving over the traclr portions along the outer side of theguides G and finally settling by gravity into the portions 28 of theguides G, as shown in Fig. 2. 0f course, when the switch from theconnections c'-c is made to the connections c--c, the movement of thecontacts 0" is vertical and parallel to the face of the panel P. On therestoration of the parts to normal position (this being accomplished, asstated, by gravity) the arms 52 are also dropped into the positionindicated by broken lines in Fig. 2 by means may be safely replaced by anovice. During the entire period of operation of the motor the contactsare maintained by the magnet M, which as explained exerts a constantpull in any. position within its normal range of'movement, and servesnot only for the purpose of moving the contacts into initial startingposition but further serves to maintain contact during the period ofoperation of the motor'until the no voltage condition occurs.

While T have shown and described an alternating current magnet of my owndesign and invention in connection with my improved switch mechanism, itwill be under stood that l do not limit myself to the use of this or anyother particular type of magnet, nor do I rely upon the specificcharacter of any of the parts or the particular ar-- rangements' andrelationships herein de scribed for. the accomplishment of the object ofmy invention. ll conceive it to be possible within the scope of theappended claims, to substantially alter and modify the structure shownwithout. departing from the spirit of my invention.

What ll claim, is:

1. A starting switch for electric motors composed of a multiple contactdevice and including a plurality of sets of spaced stationary contacts,a'plurality of movable contacts for engagement therewith, a. common.support for said movable contacts, fixed guide members for. saidsupport, a power actuated oscillatable shaft, cams fixed to said shaft,means operably connecting said cams with said movable contact supportfor advancing and retracting the movable contacts into successiveengagement with lllll corresponding members of said stationary contacts,said guide means being arranged to move said movable contacts slidablyfrom one to another of the spaced stationary contacts in a startingoperation, and having 'means for laterally retracting the movablecontacts from engagement with the final stationary contacts when thecircuit is open.

2. A starting. switch for electric motors composed of a multiple contactdevice and including a plurality of'sets of spaced stationary contacts,a plurality of movable contacts for engagement therewith, a commonsupport for said movable contacts, fixed guide members for said support,a power actuated oscillatable shaft, cams fixed to said shaft, meansoperabl connecting said cams with said movab e contact support foradvancing and retracting the movable contacts into successive engagementwithccorresponding members of said sta tionary contacts, and meanscooperating with said cams for momentarily stopping the sliding movementof said movable con-- tacts for engagement with the initial stationarycontacts, for the purpose described.

3. A starting switch for electric motors composed of a multiple contactdevice and including a plurality of sets of spaced stationar contacts, apluralityof movable contacts or engagement therewith, a common supportfor said movable contacts, fixed guide members of said support, a poweractuated oscillatable shaft, cams fixed to said shaft, means operablyconnecting said cams with said movable contact support for advancing andretracting the movable contacts into successive engagement with corresponding members of said stationary contacts, said guide means beingarranged to move said movable contacts slidably from one to another ofthe spaced stationary contacts in a starting operation, and meanscooperating with said cams for momentarily stopping the sliding movementof said movable contacts for engagement with the initial stationarycontacts, for the purpose described.

4. Astarting switch for electric motors composed of a multiple contactdevice and including a plurality of sets of spaced stationar contacts, aplurality of movable contacts or engagement therewith, a common sup ortfor said movable contacts, fixed gui e members for said support, a poweractuated oscillatable shaft, cams fixed to said shaft, means operablyconnecting said cams with said mo able contact sup ort for advancing andretracting the mova le contacts into successive engagement withcorresponding members of said stationary contacts, said guide meansbeing arranged to move said movable contacts slidably from one toanother of the spaced stationary contacts in a starting operation, andhaving means for laterally retracting the movable contacts fromengagement with the final stationary contacts when the circuit is open,and means cooperating with said cams for momentarily stopping thesliding movement of said movable contacts for engagement with theinitial stationary contacts, for the purpose described.

5. A starting switch for electric motors composed of a multiple contactdevice and including a plurality of setsof spaced stationary contacts, ap urality of mova'ble con tacts or engagement therewith, a commonsupport for said movable contacts, fixed guide members for said support,a power actuated oscillatable shaft, cams fixed to said shaft,means'operably connecting said 6. A starting switch for electric motorscomposed of a multiple contact device andincluding a pluralit of sets ofspaced stationa contacts, a p urality of movable contacts for engagementtherewith, a common support for said movable contacts, fixed guidemembers on said support, a power actuated oscillatable shaft, cams fixedto said shaft, means operably connecting said cams with said movablecontact support for advancing and retracting the movable con tacts intosuccessive engagement with corresponding members of said stationarycontacts, said guide means being arranged to move said movable contactsslidably from one to another of the spaced stationary contacts in astarting operation, means cooperating with said cams for momentarilystopping the sliding movement of said movable contacts for engagementwith the initial stationary contacts, and means for thereafter releasingsaid movable contacts for further operation and for engagement with thefinal stationary contacts.

7. A starting switch for electric motors composed of a multiple contactdevice and including a pluralit 'of sets of spaced stationary contacts,a plurality of movable contacts for engagement therewith, a commonsupport for said movable contacts, fixed guide members for said support,a power actuated oscillatable shaft, cams fixed to said shaft, meansoperably connecting said cams with said movable contact support foradvancing and retracting the movable contacts into successive engagementwith correspondin members of said stationary contacts, sai guide meansbeing arranged to move said movable contacts slidably from one toanother of the spaced stationary contacts in a starting operation, andhaving means for laterally retracting the movable contacts fromengagement with the final stationary contacts when the circuit is open,means cooperating with said cams for momentarily stopping the slidingmovement of said movable contacts for engagement with the initialstationary contacts, and means for thereafter releasing said movablecontacts for further operation and for. enga ement with the finalstationary contacts, for the purpose described.

8. A starting switch for electric motors ina given direction for guidingthe movable contacts into contact and arranged to thereafter guide saidmovable members into sliding contact with the final contact members,said trip device being reversely operable when the movable members aredisengaged from the final contact member for guiding the movable membersoutwardly from the final contact member.

9. A starting switch for electric motors including a plurality ofinitial stationary contacts, a plurality of final stationary contactsalined therewith and spaced therefrom, a plurality of movable contactmembers operably disposed in the plane of said stationary contacts andnormally disengaged therefrom, a common support for said movablecontacts, said movable contacts being arranged for successive engagementwith said initial and said final stationary contacts, guide means forsaid support including a trip device adapted to be actuated in a givendirection for guiding the movable contacts into contact and arranged tothereafter guide said movable members into sliding contact with thefinal contact members, said trip device being reversely operable whenthe movable members are disengaged from the final contact member forguiding the movable members outwardly from the final contact member, andpower operated means for momentarily holding said movable members inengagement with the initial contact members, and adapted to bethereafter automatically released for permitting the engagement of themovable members with the final contact members.

bers operably disposed in the plane of said stationary contacts andnormally disengaged therefrom, a common support for said movablecontacts, said movable contacts bemgarranged for successive engagementwith said initial and said final stationary contacts, guide means forsaid support in- 'cluding a trip device adapted to be actuated in agiven direction for guiding the movable contacts into contact andarranged to there after guide said movable members into slidinverter ingcontact with the final contact members, said trip device beingreverselyloperable when the movable members are disengaged from thefinal contact member for guiding the movable'members outwardly from thefinal contact member, and power operated means for actuating saidmovable members simultaneously. i

11. A starting switch for electric motors comprising a plurality or"sets of initial and final contact bars, a plurality of movable contactbars for successive engagement respectively with the initial and finalcontact bars, a power actuated cam arranged for operating said movablebars, means connecting said movable bars with said cams, and guide meansfor effecting a longitudinal and lateral movement of said movable barsinto and from contact with the stationary bars, said cam being arrangedfor electromagnetic operation. c

l2. A starting switch for electric motors comprising a plurality of setsof initial and final contact bars, a plurality of movable contact barsfor succes-siveengagement respectively, with the initial and finalcontact bars, a power actuated cam arranged for operating said movablebar, means connecting said movable bars with said cams, guide means forefiecting a longitudinal and lateral movement of said movable bars intoand from contactwith the stationary bars,

said cam being arranged for electro-magnetic operation, vand meanscooperating with said cam for momentarily stopping the movement of saidmovable bars when engaged with the initial contact bars.

13. A starting switch for electric motors comprising a plurality of setsof initial and final contact bars, a plurality of movable contact barsfor successive engagement, respectively, with the initial and finalcontact bars, a power actuated cam arranged for operating said movablebars, means connecting said movable bars with said cams, guide means torefiecting a longitudinal and lateral movement of said movable bars intoand from contact with the stationary bars,

netic operation, and means cooperating with said cam for momentarilystopping the movement of said movable bars when engaged with the initialcontact bars, said stopping means being arranged for electromagneticoperation.

14. A starting switch for electric motors comprising a plurality of setsof initial and final contact bars, a plurality of movable contact barsfor successive engagement, respectively, with the initial and finalcontact bars, a power actuated cam arranged for operating said movablebars, means connecting said movable bars with said cams, ide meanstoruefiiecting a longitudinal an lateral movement of said movable barsinto ltd -m0vabie bars for further operation after a.

PIQdQtQIHllIiGd interval of time, far engagemen'' with @he finalContact.

EDMUND E. TAEUBERT, Witnesses CHAPmg C. MONTGOMERY, LEO JLLIARVEY.

